Question # 1

The SI unit of work is

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Newton

Joule

Mol

Calorie

The error is constant for ............error

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Random

Systematic

Both a and b

All

Which of following is irreversible process

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Slow compression of an elastic spring

Slow evaporation of substances in isolated vessel

Slow expansion of a gas

A chemical explosion

The kinetic energy of molecules of an ideal gas at absolute zero is

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Very low

Very high

Zero

First increases then decreases

A direction of torque is

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Along the position vector r

Perpendicular to both r and f

Along the direction of force F

Opposite to the direction of r

The SI unit of flow rate are

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m-sec^-2

m³-sec^-1

m³-sec^-2

m-sec^-3

The speed of sound increases with the increase of in

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Pressure

Volume

Temperature

Density

The periodic variations of sound between maximum and minimum loudness are called.

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Doppler's effect

reflection

Laplace correction

Beats

The direction of angular velocity of along the

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Tangent at that point

Axis of rotation

Radius towards the centre

Radius away from the centre

the work done in isochoric process is.

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Constant

Variable

Zero

Depend upon condition

The equations of motion hold good for

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Variable acceleration

Uniform acceleration

Centripetal acceleration

All of these

3 Joules of work id done is 3 seconds, then power

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6 Watt

1 Watt

3 Watt

2 Watt

Efficiency of steam locomotive is.

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8%

10%

9%

7%

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

The dimensional of potential energy per unit volume are same as that of.

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Work

Pressure

Speed

Density

Height of projectile is maximum at an angle of.

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45^o

60^o

30^o

90^o

Let A = Area of cross section of pipe, v = speed of fluid, then 'Av' is called.

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Volume flow rate

Energy flow rate

Mass flow rate

Pressure flow rate

When a vector is multiplied by a (-)ve number its direction

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Remains constant

Reversed

Change by 90°

None of these

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